[erlang-questions] Creating a diagnostic memory dump of live erlang VM

Dan Gudmundsson <>
Wed Feb 19 14:40:07 CET 2014


Yes, double click on a process in the Applications or Processes tab


On Wed, Feb 19, 2014 at 2:22 PM, Vladimir Ralev <>wrote:

> This observer http://www.erlang.org/doc/man/observer_app.html ? I can't
> see such functions in there?
>
>
> On Wed, Feb 19, 2014 at 3:08 PM, Dan Gudmundsson <> wrote:
>
>> Have you tried observer?
>> Shows message boxes and gen_server states and more.
>>
>>
>>
>> On Wed, Feb 19, 2014 at 1:25 PM, Vladimir Ralev <
>> > wrote:
>>
>>> From what I've seen the crashdump doesn't really have any of the objects
>>> in the memory. If I have a string stuck in some mailbox or even just state
>>> inside a gen_server process, can I see it?
>>>
>>>
>>> On Wed, Feb 19, 2014 at 7:20 AM, Geoff Cant <> wrote:
>>>
>>>> Provided you're prepared to take down the node, you can
>>>> erlang:halt("crashdump") and you'll get a dump of memory, heaps, tables,
>>>> ... - erl_crash.dump file.
>>>>
>>>> You can view this in a web browser with crashdump_viewer.
>>>>
>>>> Crashdump debugging is unfortunate, but extremely useful. I use it on
>>>> all my production systems.
>>>>
>>>> -G
>>>>
>>>> > On 18/02/2014, at 16:00, Vladimir Ralev <>
>>>> wrote:
>>>> >
>>>> > Hello all,
>>>> >
>>>> > As a Java developer I really miss being able to create a "heap dump"
>>>> of a live Erlang VM where I can see the objects in each process and the
>>>> current process stack variables/trace. I realise there is no java-like heap
>>>> in Erlang but there are the processes, mailboxes, stacks, file handles,
>>>> sockets, ets and so on.
>>>> >
>>>> > In Java we can also use query tools to search the heaps for specific
>>>> identifying strings/numbers/timestamps to find a graph of related objects.
>>>> You can go find objects by type or find the stack variables for given
>>>> thread. It would be very useful for understanding the system in production
>>>> and diagnose issues.
>>>> >
>>>> > Would it be possible to have something like this in Erlang or it is
>>>> fundamentally not allowed?
>>>> > _______________________________________________
>>>> > erlang-questions mailing list
>>>> > 
>>>> > http://erlang.org/mailman/listinfo/erlang-questions
>>>>
>>>
>>>
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>>> 
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>>
>
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